EP0622613B1 - Kapazitive Messvorrichtung und Verfahren zu ihrer Herstellung - Google Patents

Kapazitive Messvorrichtung und Verfahren zu ihrer Herstellung Download PDF

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Publication number
EP0622613B1
EP0622613B1 EP94302919A EP94302919A EP0622613B1 EP 0622613 B1 EP0622613 B1 EP 0622613B1 EP 94302919 A EP94302919 A EP 94302919A EP 94302919 A EP94302919 A EP 94302919A EP 0622613 B1 EP0622613 B1 EP 0622613B1
Authority
EP
European Patent Office
Prior art keywords
main body
base plate
scale
electrodes
main
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP94302919A
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English (en)
French (fr)
Other versions
EP0622613A1 (de
Inventor
Hiroshi Koizumi
Tamio Suzuki
Toshiyuki Shirai
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitutoyo Corp
Original Assignee
Mitutoyo Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP5099355A external-priority patent/JP2807392B2/ja
Priority claimed from JP29067593A external-priority patent/JP2807404B2/ja
Application filed by Mitutoyo Corp filed Critical Mitutoyo Corp
Publication of EP0622613A1 publication Critical patent/EP0622613A1/de
Application granted granted Critical
Publication of EP0622613B1 publication Critical patent/EP0622613B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B3/00—Measuring instruments characterised by the use of mechanical techniques
    • G01B3/002—Details
    • G01B3/004—Scales; Graduations
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/24—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance
    • G01D5/241—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance by relative movement of capacitor electrodes
    • G01D5/2412—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance by relative movement of capacitor electrodes by varying overlap
    • G01D5/2415—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance by relative movement of capacitor electrodes by varying overlap adapted for encoders
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making

Definitions

  • This invention is broadly concerned with an electrical capacitance instrument and a manufacturing method of the same and intended particularly to be used to improve a high-volume productivity of electrical capacitance instrument and a manufacturing method thereof.
  • the conventional electronic measuring instrument is generally defined by a main body and a measuring element being adapted to move in relation to the main body.
  • the instant displacement value of the measuring element is transformed into electrical signals by an conventionally known electrical capacitance instrument to be displayed in numerical values.
  • the electrical capacitance instrument includes a main scale which has a plurality of electrodes thereon arranged at a fixed spacing from one another and a measuring element which has electrodes corresponding to the electrodes provided on the mains scale in a statically relating state.
  • the displacement value of the measuring element is transformed into electrical signals based on the electrical capacitance changed in accordance with the displacement value of the measuring element.
  • the main scale is generally manufactured separately from a main body of the instrument and then secured on the main body by means of a bonding agent.
  • the manufacturing process for the main scale does not attain a high-volume productivity due to the number of steps involved, that is, a step for evaporating metal membrane on a base plate made from epoxy-glass having insulation properties, a step for masking necessary area on the metal membrane, a step for forming plural electrodes by etching unnecessary area on the metal membrane, and a step for forming an insulation membrane to cover surface of the electrodes.
  • an object of the present invention is to provide an ideal electrical capacitance instrument in preferable high-volume productivity and a manufacturing method of the same.
  • IBM Technical Disclosure Bulletin vol. 21, no. 1, June 1978, pages 242-243 discloses an electrical capacitance instrument having a main scale on a main body and a measuring element which is arranged to move in relation to the main body to provide a measurement of a displacement value of the measuring element relative to the main body; wherein the main scale is provided by an insulating base plate, and a plurality of electrodes printed with an electrically conductive ink on the base plate at intervals along the direction of movement of the measuring element; and according to a first aspect of the present invention such an instrument is characterised by an insulating bonding layer formed over the electrodes and between the base plate and the main body and bonding the main scale to the main body.
  • the main body is made of a material having insulation properties and the plural electrodes are shielded by a coating layer made of a material having insulation properties.
  • the main scale is applied to the main body by means of a bonding layer provided on a surface to which the plural electrodes of the base plate have already been printed.
  • the main body uses a material having insulation properties, particularly engineering plastics (e.g., a synthetic resin of polybutylene terphthalate) as its base material and the base material may further include minerals such as kalium titanate.
  • the base plate is preferably made of a film having plasticity.
  • the base plate can be made of a transparent material and the slide calipers may further include a decorative printing layer to print thereon characters or patterns between the one surface of the base plate and an electrode layer printed with the electrodes.
  • the main body may be a base scale having at least one measuring jaw, and wherein the measuring element is adapted to move along the base scale in a sliding contact state with the base scale and has at least one measuring jaw corresponding to that of the base scale.
  • the base plate can be made of a transparent material and the invented method can further include a step for making a decorative printing layer to print characters or patterns on the base plate and printing plural electrodes on the decorative printing layer.
  • the main body can be formed by means of an injection mold using a material having insulation properties.
  • the main body is provided with the main scale having plural electrodes printed thereon by means of an electrically conductive ink, compared to the conventional main scale forming method of forming electrodes thereon by etching, the production of the main scale of the present invention is far easier and simpler.
  • the bonding layer is formed by applying a bonding agent on a surface on which the electrodes of the base plate are already painted, the bonding layer produces a smooth surface to which the main scale is applied on the main body and an insulation layer will not be required due to an insulation state between the electrodes. If the base plate is of a film having plasticity, it will be preferable to apply the main scale to the main body securely.
  • the base plate is made of a transparent material and the decorative printing layer is additionally intervened between the base plate and the electrode layer, the painted characters or patters on the decorative printing layer can be read out through the base plate.
  • the material for the main body is a material having insulation properties, particularly engineering plastics capable of being molded by injection, a large number of the same main bodies can be produced. Furthermore, the main body itself becomes an insulation member, so that it is not necessary to prepare an insulation layer additionally between the main body and the main scale to provide sufficient insulation.
  • FIG. 1 An example according to the present invention will hereunder be described with reference to FIGs. 1 - 4.
  • the following example discloses a slide caliper in which an electrical capacitance instrument according to the present invention is preferably utilized.
  • the slide caliper is, as shown in FIG. 1, defined by a base scale 1 of a main body laterally extending on the drawing and a slider 10 of a measuring element movable into a longitudinal direction on the base scale 1.
  • the base scale 1 is made by an injection molding method by means of engineering plastics having sufficient insulation properties.
  • the engineering plastics uses a synthetic resin of polybutylene terphthalate (hereinafter referred to "PBT") resin as a base material and additionally includes mineral such as kalium titanate to have stiffness and wear-resistance properties and lightness in weight compared with steel.
  • PBT polybutylene terphthalate
  • the weight of the base scale 1 is lightened in weight by about one fifth of that made of metal.
  • the base scale 1 is provided with a main scale 20 in a state that the front surface of the base scale 1 is entirely covered with the main scale 20.
  • the main scale 20 has at a fixed spacing from one another plural lattice electrodes 21 defining an electrical capacitance encoder 40.
  • the slider 10 is produced by means of the same material (engineering plastics) and the same method (injection molding method) as those in the base scale 1.
  • the slider 10 integrally has at the left end most thereof an inboard measuring jaw 12 and an outboard measuring jaw 13 to correspond to the inboard measuring jaw 2 and the outboard measuring jaw 3 of the base scale 1.
  • a digital display 14 to display an instant displacement value of the slider 10 in digital, a power-off switch 15, a switch 16 served both as a power-on switch and a zero-setting switch and so on.
  • the main scale 20 adapted to put on the base scale 1 is depicted in an enlarged state.
  • the main scale 20 should be understood as to be finished with a printing of electrodes 21 on a front surface of the web-shaped base plate 22.
  • the main scale 20 has a multi-layer construction defined by a decorative printing layer 23, an electrode layer 24 and a bonding layer 25, each layer lying one above the other in this order or downwardly from the surface of the base plate 22 as shown in FIG. 3.
  • the base plate 22 is made of polyester transparent film having a thickness of 0.125 mm and plasticity properties and is formed into a predetermined configuration.
  • the decorative printing layer 23 is a membrane of the ink at a thickness of about 0.125 mm and is formed by being directly put on the surface of the base plate 22.
  • the decorative printing layer 23 is used to draw characters or slit patterns 26. When drawing some characters or patterns, they can be seen from an opposite side of the base plate 22 since the base plate 22 is transparent.
  • the electrode layer 24 is a membrane of an electrically conductive ink (e.g., an electrically conductive ink containing carbon graphite, polyester resin and solvent by a weight ratio of 30%, 25 and 45% respectively) printed on the decorative printing layer 23 at a thickness of about 0.021 mm.
  • the electrode layer 24 has plural rectangular electrodes 21 printed with electrically conductive ink along a longitudinal direction of the main scale 20.
  • the shape of the electrode 21 can be defined by a long side of which dimension is almost the same as the width of the base plate 22 and a short side having a predetermined length.
  • the bonding layer 25 is of a membrane of a bonding agent entirely applying over the electrode layer 24 by a thickness of about 0.16 mm.
  • the applicable bonding agent is for example a double-adhesive tape.
  • the bonding agent is much supplied into spaces disposed between nearby electrodes 24 or portions other than the electrodes 21 of the electrode layer 24 until reaching to the surface of the decorative printing layer 23.
  • the electrical capacitance encoder 40 is defined by the above explained lattice electrodes 21 which are printed successively on the base scale 1 every certain intervals, earth ground electrode (not shown) electrically arranged between these electrodes 21, plural sets of sending electrodes 41 provided in the slider 10 each of which is composed with eight electrodes arranged at certain intervals along the base scale 1, a receiving electrode 42 arranged along a series of the sending electrodes 41 in a web state, a sending circuit 43 to impress into the sending electrodes 41 signals dividing 360 degrees into eight different phases, a receiving circuit 44 to receive signals from the receiving electrode 42 presenting different phase based on an instant displacement value between the sending electrodes 41 and the electrodes 21.
  • An output from the receiving circuit 44 or originally issued from the electrical capacitance encoder 40 is counted in a counter 45 and then diplayed in digital by means of the digital display 14 after a predetermined processing in a CPU 46.
  • the counted value in the counter 45 can be reset at "0" value when the zero-setting switch 16 is pressed. If necessary, the measured value may be printed out or further processed through a transmitter 47 in an external printer by sending data processed in the CPU 46 through a cable or by radio.
  • the slider 10 is moved to measure an object to be measured from a situation that the inboard measuring jaws 2 and 12 of the base scale 1 and the slider 10 are contacting to each other.
  • the displacement value of the slider 10 can be detected by the electrical capacitance encoder 40 and is then displayed in digital by means of the digital display 14. Accordingly, the measurement in the above mentioned first embodiment is performed simply by abutting the inboard measuring jaws 2 and 12 12 or the outboard measuring jaws 3 and 13 to both ends of the object to be measured respectively to obtain measured value on the digital display 14.
  • the measuring jaws 2 and 12 When measuring inner diameter of a hole provided in the object to be measured, the measuring jaws 2 and 12 are respectively abutted an inner surface of the hole to display the measured value in digital by means of the digital display 14, which should be an easy measuring work for an operator.
  • the outboard measuring jaws 3 and 13 When measuring a thickness of the object to be measured, the outboard measuring jaws 3 and 13 are utilized such that they are abutted to a portion to be measured to thereby obtain the objective thickness in digital by the digital display 14.
  • main scales 20 are printed on a large polyester sheet all together and then covered entirely with the bonding agent to form the bonding layer 25, so that the respective main scales 20 can be obtained as required by cutting the large polyester sheet.
  • the surface of the bonding layer 25 of the main scale 20 is preferably shielded with a temporary sheet cover until being attached on to the base scale 1 to secure bonding layer 25 to ensure a firm attachment of the main scale 20.
  • the base scale 1 and the slider 10 are manufactured by means of the injection molding machine wherein the engineering plastics are consumed as materials.
  • the main scale 20 is attached securely and then the base scale 1 is combined with the slider 10.
  • the slider calipers according to the present invention will be completed after fine adjustments for several combined parts.
  • the example according to the present invention is merited in developing a high-volume productivity of the main scales 20, as plural main scales 20 can be manufactured by printing electrodes 21 all at once on the large film of an insulator film. Since the base scale 1 and the slider 10 are made of engineering plastics which can be injected from a mold, a desirable high-volume productivity of the base scale 1 and the slider 10 can be achieved.
  • the bonding layer 25 is formed by applying the bonding agents on the surface where the electrodes 21 of the base plate 22 are made in advance before attaching the main scale 20 to the base scale 1, the attachment work of the main scale 20 toward the main body 1 can be proceeded smoothly by means of the bonding layer 25 and there is no necessity to provide an insulation layer additionally because of a mutual insulation state of the respective electrodes 21.
  • the fine attachment work of the main scale 20 to the base scale 1 may be performed as the base plate 22 is of a film having plasticity.
  • any character or pattern 26 printed on the decorative printing layer 23 can be seen clearly through the base plate 22.
  • the base scale 1 and the slider 10 are both made of engineering plastics so that the base scale 1 can be kept in an insulated state. It will not be required to have the insulation layer between the base scale 1 and the main scale 20 to obtain insulation properties between nearby electrodes 21 of the main scale 20 attached on the base scale 1. Furthermore, the insulation properties between the electrodes 21 can be improved due to the mentioned bonding layer 25 for the main scale 20.
  • the electrodes 21 are formed by painting and the base scale 1 and the slider 10 are made of engineering plastics, the high-volume productivity of respective components is improved.
  • the bonding layer 25 brings a result on an attachment work to the main scale 20, the productivity of the slide calipers can be extremely improved to thereby achieve reduced cost.
  • the base scale 1 is made of engineering plastics, a further lightweighting can be achieved to thereby improve a comfortable operation and handling.
  • the slide calipers to measure a straight distance such as inner diameter, length or the like by moving the slider 10 of the measuring element in a sliding contact state with the base scale 1, but the present invention can be applied also to a rotation angle measuring instrument such as a rotary encoder to measure an angle of rotation degrees when a measuring element and a main scale are moved relatively to each other.
  • a rotation angle measuring instrument such as a rotary encoder to measure an angle of rotation degrees when a measuring element and a main scale are moved relatively to each other.
  • the main scale should be formed, as shown in FIG. 5, into a disc-shaped base plate 32 made of synthetic resin film with plural electrodes 31 printed thereon by predetermined intervals angularly.
  • the material for the base scale 1 and the slider 10 are not only to be engineering plastics composed with PBT resin and additional mineral and CFRP but carbon fiber reinforced plastic using the base material such as nylon resin having stiffness properties to which a fiber such as glass are supplied.
  • the base material and the supplied material may be naturally other resins and fibers. Taking for an instance for the base material, there are applicable to be used ABS resin and jyuracon (polyacetal resin) having high wear-resistant properties.
  • the supplied material may be a single fiber such as glass fiber or KEVLAR (trademark) otherwise a composite fiber thereof.
  • the electrically conductive ink used for printing the electrodes 21 contains carbon graphite and polyester resins in the above mentioned embodiments but may be made of carbon paste and medium or made of silver paste.
  • the base plate 22 for the main scale is not only limited to be one made of polyester but other synthetic resin such as triacetate, polystyrene or the like.
  • the present invention can be applied to other apparatus than the slide calipers, for example, a measuring apparatus such as height gauge and a feeding value displaying apparatus for a machine tool such as drilling machine. If the main scale is formed into a web state and then applied on a similar web shaped plastic member made of metal or synthetic resin, a tape measure displaying the measured value in digital can be provided.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Length-Measuring Instruments Using Mechanical Means (AREA)

Claims (10)

  1. Elektrische kapazitive Vorrichtung mit einer Hauptskala auf einem Hauptkörper (1) und einem Meßelement (10), das relativ zum Hauptkörper bewegbar ist, um einen Verschiebungsbetrag des Meßelements relativ zum Hauptkörper zu messen; wobei die Hauptskala durch eine isolierende Basisplatte (22) und eine Vielzahl von Elektroden (21), die mittels elektrisch leitender Tinte auf der Basisplatte in Abständen in Richtung der Bewegung des Meßelements aufgedruckt sind, gebildet ist, gekennzeichnet durch eine isolierende Bindemittelschicht (25), die über den Elektroden und zwischen der Basisplatte und dem Hauptkörper ausgebildet ist und die Hauptskala mit dem Hauptkörper verbindet.
  2. Vorrichtung nach Anspruch 1, bei der die Basisplatte (22) aus einem transparenten Material hergestellt ist.
  3. Vorrichtung nach Anspruch 1 oder Anspruch 2, bei der die Basisplatte (22) aus einer plastischen Folie hergestellt ist.
  4. Vorrichtung nach einem der vorstehenden Ansprüche, bei der die Hauptskala eine Dekorationsschicht (23) aufweist, die mit Zeichen oder Mustern bedruckt und zwischen der Hauptplatte (22) und einer Elektrodenschicht (24) der gedruckten Elektroden angeordnet ist.
  5. Vorrichtung nach einem der vorstehenden Ansprüche, bei der der Hauptkörper (1) aus einem Material mit Isolationseigenschaften hergestellt ist.
  6. Vorrichtung nach einem der vorstehenden Ansprüche, bei der der Hauptkörper (1) aus technischem Kunststoff hergestellt ist.
  7. Vorrichtung nach einem der vorstehenden Ansprüche, bei der der Hauptkörper (1) wenigstens einen Meßfühler (2, 3) aufweist und das Meßelement (10) so ausgebildet ist, daß es längs des Hauptkörpers in gleitender Berührung mit der Hauptskala bewegbar ist und wenigstens einen Meßfühler (12, 13) aufweist, der dem (denen) der Hauptskala entspricht.
  8. Verfahren zum Herstellen einer elektrischen kapazitiven Vorrichtung, die einen Hauptkörper (1) mit einer Hauptskala und ein Meßelement (10) aufweist, das relativ zu dem Hauptkörper bewegbar ist, um eine Messung eines Verschiebungsbetrags des Meßelements relativ zum Hauptkörper zu bewirken, wobei eine Vielzahl von Elektroden (21) auf einer Basisplatte (22) aus einer isolierenden Folie in Abständen mittels elektrisch leitender Tinte zur Ausbildung der Hauptskala aufgedruckt werden, gekennzeichnet durch die Ausbildung einer isolierenden Bindemittelschicht (25) auf der Basisplatte und das Abdecken der Elektroden sowie das Verbinden der Basisplatte mit dem Hauptkörper durch die Bindemittelschicht, so daß die Bindemittelschicht zwischen der Basisplatte und dem Hauptkörper liegt.
  9. Verfahren nach Anspruch 8, bei dem die Basisplatte (12) aus einem transparenten Material hergestellt wird und eine gedruckte Dekorationsschicht (23) auf der Basisplatte ausgebildet und die Elektroden auf der Dekorationsschicht aufgedruckt werden.
  10. Verfahren nach Anspruch 8 oder Anspruch 9, bei dem der Hauptkörper (22) im Spritzgußverfahren geformt wird.
EP94302919A 1993-04-26 1994-04-25 Kapazitive Messvorrichtung und Verfahren zu ihrer Herstellung Expired - Lifetime EP0622613B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP99355/93 1993-04-26
JP5099355A JP2807392B2 (ja) 1993-04-26 1993-04-26 ノギス
JP290675/93 1993-11-19
JP29067593A JP2807404B2 (ja) 1993-11-19 1993-11-19 静電容量式測定装置およびその製造方法

Publications (2)

Publication Number Publication Date
EP0622613A1 EP0622613A1 (de) 1994-11-02
EP0622613B1 true EP0622613B1 (de) 1997-06-18

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EP94302919A Expired - Lifetime EP0622613B1 (de) 1993-04-26 1994-04-25 Kapazitive Messvorrichtung und Verfahren zu ihrer Herstellung

Country Status (4)

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US (1) US5477621A (de)
EP (1) EP0622613B1 (de)
CN (1) CN1057604C (de)
DE (1) DE69403856T2 (de)

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US5973494A (en) * 1996-05-13 1999-10-26 Mitutoyo Corporation Electronic caliper using a self-contained, low power inductive position transducer
US6002250A (en) * 1996-05-13 1999-12-14 Mitutoyo Corporation Electronic linear scale using a self-contained, low-power inductive position transducer
USD429172S (en) * 1998-06-26 2000-08-08 Brown & Sharpe Tesa S.A. Micrometer
CN1125969C (zh) * 1998-07-21 2003-10-29 陈其良 一种电容式数显卡尺
CN2343572Y (zh) * 1998-08-20 1999-10-13 陈其良 一种容栅式数显卡尺
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CA2396126C (en) * 1999-11-01 2009-01-20 Rusi I. Nikolov Universal measuring scriber
CN1415931A (zh) * 2002-10-22 2003-05-07 赵飙 滚动电容数显卡尺
CN2765139Y (zh) * 2004-12-27 2006-03-15 杨忠义 双柱式数显高度规
US20080189971A1 (en) * 2007-02-14 2008-08-14 Lin Wo Electronic disc and drum brake gauge
GB0720408D0 (en) 2007-10-18 2007-11-28 Renishaw Plc Metrological scale and method of manufacture
US20090223075A1 (en) * 2008-03-07 2009-09-10 Lin Wo Gage for measuring drum brake inside diameter
US8209874B1 (en) * 2008-03-13 2012-07-03 Tri-Walker, LLC Building frame construction tools and methods using laser alignment
US8522445B1 (en) * 2011-04-07 2013-09-03 John H. Scribante Marking gauge for electronic measurement and display
CN103837059A (zh) * 2012-11-20 2014-06-04 上海华虹宏力半导体制造有限公司 离子源电弧狭缝的校正工具及方法
CN104181201A (zh) * 2013-05-24 2014-12-03 深圳市海洋王照明工程有限公司 塑胶材料防起电性能测试装置
KR101547446B1 (ko) * 2015-06-09 2015-08-26 주식회사 아모텍 입자상 물질 센서 및 그를 이용한 배기가스 정화 시스템
JP6790409B2 (ja) * 2016-03-25 2020-11-25 ヤマハ株式会社 位置検出装置及び位置検出方法
JP7016720B2 (ja) * 2018-02-19 2022-02-07 株式会社ミツトヨ 送り機構およびそれを備えた測定器

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Also Published As

Publication number Publication date
CN1057604C (zh) 2000-10-18
US5477621A (en) 1995-12-26
DE69403856D1 (de) 1997-07-24
CN1098501A (zh) 1995-02-08
EP0622613A1 (de) 1994-11-02
DE69403856T2 (de) 1997-10-09

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